Six people, including one foreigner, were killed in the country's worst terror attack since 2009. Ten others were injured.

Police also shot dead four attackers, according to Budi Gunawan, Deputy Chief of Indonesian National Police.

The country's President, Joko Widodo, called the blasts "acts of terror."

"Our nation and our people should not be afraid, we will not be defeated by these acts of terror, I hope the public stay calm," he told local broadcaster MetroTV.

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At present, no group has claimed responsibility for the attack.

Photos:Deadly explosions, gunfight in Jakarta

Employees inspect the damage on January 15, 2016 at the Starbucks cafe where deadly attacks occurred the day before in central Jakarta, Indonesia. ISIS claimed responsibility for the attack in an official statement posted online.

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Photos:Deadly explosions, gunfight in Jakarta

Students light candles to express solidarity for those affected by the deadly attack in Jakarta during a vigil on January 14 in Surabaya, East Java, Indonesia.

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Photos:Deadly explosions, gunfight in Jakarta

A bouquet of flowers is placed in front of an explosion site on January 14 in Jakarta.

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Photos:Deadly explosions, gunfight in Jakarta

A policeman stands guard in front of a blast site in central Jakarta after a series of explosions rocked the heart of the Indonesian capital on Thursday, January 14.

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Photos:Deadly explosions, gunfight in Jakarta

Police and ambulances arrive in front of the Sarinah shopping center, next to a police station targeted by the attacks, on January 14.

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Photos:Deadly explosions, gunfight in Jakarta

Armed police officers keep watch outside a damaged Starbucks cafe after an attack in Jakarta on January 14.

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Police officers stand guard outside a Starbucks cafe in Jakarta's bustling shopping area, near the site of an explosion, on January 14.

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Photos:Deadly explosions, gunfight in Jakarta

Police officers are deployed near the site where a series of blasts rocked downtown Jakarta on January 14.

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Photos:Deadly explosions, gunfight in Jakarta

Indonesian police take position and aim their weapons as they pursue suspects outside a cafe after explosions went off in Jakarta on January 14.

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Smoke billows from an explosion in downtown Jakarta on January 14.

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Plainclothes police officers aim their guns at suspects outside a cafe after a series of blasts hit the center of Jakarta on January 14.

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Photos:Deadly explosions, gunfight in Jakarta

Smoke rises following a series of blasts outside a shopping center in Jakarta on January 14.

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Photos:Deadly explosions, gunfight in Jakarta

Indonesian police take position behind a vehicle as they pursue suspects after a series of blasts hit the center of Jakarta on January 14.

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A policeman fires his handgun towards suspects outside a cafe on January 14.

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A body lies in the middle of the street near a damaged police post on January 14.

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Police hide behind vehicles during an exchange of gunfire with suspects hiding near a Starbucks cafe when another blast took place in Jakarta on January 14.

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Police appear to chase suspects thought to be hiding at a cafe on January 14.

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Who could be behind it?

ISIS has a presence in Indonesia, where it has long sought to establish a "distant caliphate" in Indonesia, according to the Australian Attorney-General George Brandis.

Speaking in the wake of Thursday's attack, Clarke Jones, a counterterrorism expert at the Australian National University, said that such an incident is not a great surprise.

"There was warning some weeks and even months ago that Indonesia was likely to experience some sort of attack," he told CNN.

Aftermath of the 2002 Bali bombings, in which more than 200 people were killed.

Homegrown terror

Indonesia has long struggled with domestic terrorist groups, particularly Jemaah Islamiyah, which claimed responsibility for 11 attacks between 2000 and 2010, including the deadly 2002 Bali bombings, which left more than 200 people dead and hundreds injured, many of them tourists.

Smaller groups have also claimed responsibility for attacks and bombings across the country, including the 2005 beheading of three Christian teenagers by Muslim militants in the Poso region of Sulawesi.

Jemaah Islamiyah, which has been linked to Al Qaeda, has largely replaced Darul Islam as Indonesia's deadliest local terrorist organization. The group aims to establish a regional Islamic caliphate in Southeast Asia and has also been active in Thailand, Malaysia and the Philippines.

However, Jemaah Islamiyah's capabilities have been steadily eroded by a concerted counter-terrorism effort since 2009.

Indonesia has invested heavily in counter-terrorism, establishing the elite special forces unit Detachment 88, which has received support and training from the U.S. and Australia, and has been credited with greatly reducing the number of attacks since 2009.

According to a report by the Jamestown Foundation, in recent years Indonesia has been "widely viewed as a counter-terrorism success story as the threat from al-Qaeda-linked or -inspired jihadist groups declined dramatically."

"Unfortunately, the transnational pull of the conflicts in Syria and Iraq, and the emergence of the Islamic State, risk undermining Indonesia's counter-terrorism successes," the report warns.